Silverlight 2 is missing the unload event for a UserControl. Has anyone implemented a workaround for this?
A:
I think the closest you'll get is Application Services which let you detect when the Silverlight application is closing and respond to it. If you're using a Navigation application then you can hook into the Navigating event of the parent frame to determine that the page is "unloading".
What are you trying to do that requires a UserControl to respond to an unloading event?
Bryant
2009-11-12 18:18:24
The usercontrol has background worker threads retrieving data from a web service. These workers need to be closed down in an orderly fashion if the usercontrol is closed.
Phillip Ngan
2009-11-13 00:26:58
I'd put those background workers somewhere else and shut them down when you're no longer displaying the user control.
Bryant
2009-11-13 01:22:29
+1
A:
you might want to look here: http://gallery.expression.microsoft.com/en-us/SLUnloadedBehavior
The code is for SL 3 but if you remove the behavior code it should work for Sl2
@KeithMahony
One scenario is that you want to prevent event memory leaks, one of the pitfalls of silverlight development that most people tend to ignore.
Martin Wawrusch
2010-03-20 22:31:10
A:
Consider using Silverlight 4. I comes with - at last - an Unloaded event.
BaBu
2010-09-07 15:49:43
But - alas - note that its usefulness is limited. From the doc: "Unloaded is not raised for any object if the Silverlight application shuts down for any reason. This includes cases where the browser host application or out-of-browser window is closed by the user."
BaBu
2010-09-07 16:52:17